Fix miscased Fore.Yellow in DataClassNode.print

[ESultanik]

Closes #153

graphtage/dataclasses.py:150 spelled the colorama attribute as Fore.Yellow. The real attribute is Fore.YELLOW, which is what every other call site in the package uses, so DataClassNode.print() raised AttributeError: 'AnsiFore' object has no attribute 'Yellow' every time it ran.

DataClassNode.print() is the fallback rendering path that TreeNode.print() takes when no formatter resolves the node type (graphtage/tree.py:72-76), so any DataClassNode subclass without a dedicated formatter crashed instead of printing. The failure was not limited to color output: the attribute is read to build the argument to printer.color(), before the only_ansi wrapper on that method can skip the context, so it also crashed with ansi_color=False.

The fix is one character. The rest of DataClassNode.print() renders correctly once it is reachable — Foo(name="x", count=3), with the class name yellow, the slot names red, and the = bright.

Validation

Two regression tests in test/test_dataclasses.py call DataClassNode.print() directly, which is what reaches the buggy path:

• test_print_renders_slots asserts the uncolored rendering equals Foo(name="x", count=3).
• test_print_colors_the_class_name_yellow asserts Fore.YELLOW precedes the class name under ansi_color=True.

Both tests were confirmed to catch the bug:

• Against the unfixed code, both fail with AttributeError: 'AnsiFore' object has no attribute 'Yellow'.
• With the color context removed entirely rather than corrected, test_print_colors_the_class_name_yellow fails on the missing escape, so a silently dropped color is caught as well as a crash.

Local CI, all passing:

• ruff check graphtage test docs bindist
• pytest (142 passed)
• make -C docs html SPHINXOPTS="-W --keep-going"

uv lock --check reports the lockfile needs updating, but it does so identically on a pristine checkout of master in this environment (a global exclude-newer setting forces re-resolution). Neither pyproject.toml nor uv.lock is touched by this change.

I also grepped the package for other miscased colorama attributes across Fore., Back., and Style.. This was the only one.

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https://claude.ai/code/session_01GypKU5KdLfs2Cf8kS2TzJa